The Curonians or Kurs were a medieval Baltic tribe living on the shores of the Baltic Sea in the 5th–16th centuries, in what are now western parts of Latvia and Lithuania. They eventually merged with other Baltic tribes contributing to the ethnogenesis of present-day Latvians and Lithuanians. Curonians gave their name to the region of Courland (Kurzeme), and they spoke the Curonian language.

Sigurd Ring according to legend was a king of the Swedes, being mentioned in many old Scandinavian sagas. According to these sources he was granted rulership over Sweden as a vassal king under his uncle Harald Wartooth. Later he would take up arms against his uncle Harald in a bid to overthrow him and take the crown of Denmark, a conflict which Sigurd eventually won after the legendary Battle of the Brávellir, where it is said that Odin himself intervened and killed Harald. In the Sagas, Sigurd is also known for being the father of the Norse Viking hero and legendary king of Denmark and Sweden, Ragnar Lodbrok. According to Bósa saga ok Herrauds, there was once a saga on Sigurd Ring, but this saga is now lost.